Wreck Crisis (for Navy and Cobalt fans) (Patreon)

"!!!!!!!!"

It was going to be a fun, uneventful dive. Take a deep breath, swim down for a few dozen meters, explore, and be done before the pains in the chest become too forbidding. But sigh, the beautiful diver thought, she was now going to be there for some time. 

...What do you think has happened? (Write in the comments below!!)